Initial commit: CRDC Arrests API demo app

React + Vite static site demonstrating the CRDC School Arrest Rate API.
Features 6 interactive charts comparing observed arrest data against Bayesian
model estimates across U.S. school districts, with Civilytics visual identity.

- State selector and district search with 'interesting' suggestions (top arrests)
- Animated histogram loading grid showing posterior draw progress
- Charts: time series, rate by group, district vs national, model comparison quadrants, density proxy, exceedance probability
- Static JSON fixture for national rates (no API changes needed)
- Dockerfile + docker-compose.yml for self-hosted deployment
- GitHub Actions workflow and _config.yml for Git Pages

docker-compose.yml

@@ -0,0 +1,12 @@
+# Docker Compose for local development or self-hosted deployment on your fleet.
+# Usage: docker compose up -d
+
+services:
+  crdc-demo:
+    build: .
+    ports:
+      - "8080:80"   # Map host port 8080 → container port 80 (nginx)
+    restart: unless-stopped
+    environment:
+      # Override to point at a staging API if needed; defaults to production.
+      VITE_API_BASE: https://crdc-api.civilytics.org/api/v1